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Note 25 - Contingencies, Commitments and Restrictions On the Distribution of Profits (Details Textual)
R$ / shares in Units, $ in Thousands, € in Millions, R$ in Millions, $ in Billions
 1 Months Ended 12 Months Ended 24 Months Ended
Dec. 21, 2017
USD ($)
Dec. 21, 2017
EUR (€)
Jun. 30, 2017
USD ($)
Sep. 01, 2013
R$ / shares
shares
Nov. 30, 2017
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
BRL (R$)
Aug. 31, 2017
USD ($)
Aug. 31, 2017
MXN ($)
Jul. 07, 2016
USD ($)
Jan. 31, 2016
USD ($)
Jan. 31, 2016
EUR (€)
Jan. 22, 2016
USD ($)
Feb. 28, 2014
USD ($)
Feb. 28, 2014
EUR (€)
Dec. 24, 2013
USD ($)
Dec. 24, 2013
EUR (€)
Dec. 24, 2012
USD ($)
Dec. 24, 2012
EUR (€)
Equity in accordance with Luxembourg law [member]                                        
Statement Line Items [Line Items]                                        
Distributable retained earnings           $ 17,566,494 $ 17,566,494                          
Techgen s.a. [member]                                        
Statement Line Items [Line Items]                                        
Term of supply contract             25 years                          
Proportion of corporate guarantee covering obligations           22.00% 22.00% 22.00%                        
Voest Alpine Grobblech Gmb [member]                                        
Statement Line Items [Line Items]                                        
Purchase commitments           $ 137,000 $ 137,000                          
Transportadora de Gas del Norte S.A. [member]                                        
Statement Line Items [Line Items]                                        
Purchase commitments           $ 77,500 77,500                          
Term of supply contract           10 years                            
Praxair S.A. [member]                                        
Statement Line Items [Line Items]                                        
Purchase commitments           $ 43,900 43,900                          
Term of supply contract           14 years                            
Graftech [member]                                        
Statement Line Items [Line Items]                                        
Purchase commitments           $ 78,300 78,300                          
DALMINE S.p.A. [member] | Italian tax authorities [member] | Legal proceedings contingent liability [member]                                        
Statement Line Items [Line Items]                                        
Estimated financial effect of contingent liabilities                             $ 11,000 € 9.0 $ 271,000 € 226.0 $ 357,000 € 298.0
Bank acceptance liabilities                       $ 210,000 € 175.0              
Aggregate cash payments for legal settlements $ 51,000 € 42.9                                    
Cash payments during legal proceedings 4,000 € 3.2                                    
Excess amount provisioned for estimated financial effect of contingent liabilities $ 29,000                                      
CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Legal proceedings contingent liability [member]                                        
Statement Line Items [Line Items]                                        
Estimated financial effect of contingent liabilities           40,500 40,500 R$ 133.9                        
CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Companhia Siderúrgica Nacional [member]                                        
Statement Line Items [Line Items]                                        
Tag-along tender offer to non-controlling interests, percentage       80.00%                                
Tag-along tender offer to non-controlling interests | R$ / shares       R$ 28.80                                
Tag-along tender offer to non-controlling interests, shares | shares       182,609,851                                
CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Companhia Siderúrgica Nacional [member] | Legal proceedings contingent liability [member]                                        
Statement Line Items [Line Items]                                        
Tag-along tender offer to non-controlling interests, contingent liability       17.90%                                
CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Itaú Seguros S.A. [member] | Legal proceedings contingent liability [member]                                        
Statement Line Items [Line Items]                                        
Estimated financial effect of contingent liabilities           24,800 24,800 81.9                        
Estimated percentage of lost profits         54.00%                              
CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Veracel Celulose S.A. [member] | Legal proceedings contingent liability [member]                                        
Statement Line Items [Line Items]                                        
Estimated financial effect of contingent liabilities           $ 15,700 $ 15,700 R$ 52.0                        
TENARIS GLOBAL SERVICES S.A. and subsidiaries [member] | Petroamazonas [member] | Legal proceedings contingent liability [member]                                        
Statement Line Items [Line Items]                                        
Estimated financial effect of contingent liabilities                           $ 22,500            
TENARIS BAY CITY, INC. [member] | Contractor [member] | Legal proceedings contingent liability [member]                                        
Statement Line Items [Line Items]                                        
Total excess cost of project     $ 77,000                                  
SIDERCA S.A.I.C. and subsidiaries [member] | Legal proceedings contingent liability [member]                                        
Statement Line Items [Line Items]                                        
Number of alleged inaccurate currency exchange declarations           15 15 15                        
Amount alleged inaccurate for the export of goods           $ 268,000                            
Loss contingency, multiple of fine application possible           10 10 10                        
SIDERCA S.A.I.C. and subsidiaries [member] | Argentine state-owned company [member] | Legal proceedings contingent liability [member]                                        
Statement Line Items [Line Items]                                        
Estimated financial effect of contingent liabilities                     $ 25,400                  
Tubos de Acero de México S.A and Servicios Generales Tenaris Tamsa S.A. [member] | Mexican tax authorities [member] | Legal proceedings contingent liability [member]                                        
Statement Line Items [Line Items]                                        
Estimated financial effect of contingent liabilities                 $ 91,200 $ 1.8